Supply air terminal device

ABSTRACT

The invention concerns a supply air terminal device ( 10 ) including a supply chamber ( 11 ) for the supply air and in the supply chamber ( 11 ) nozzles ( 12   a   1   , 12   a   2  . . . ;  12   b   1   , 12   b   2  . . . ), through which the supply airflow (L 1 ) is conducted into a side chamber (B 1 ) of the supply air terminal device, which side chamber is a structure open at the top part and at the bottom part. The supply air terminal device ( 10 ) includes a heat exchanger ( 14 ), which can be used either to cool or to heat the circulated airflow (L 2 ). In the device solution, fresh supply air, which is conducted through the nozzles to the side chamber (B 1 ), induces the circulated airflow (L 2 ) to flow through the heat exchanger ( 14 ). The combined airflow (L 1 +L 2 ) of supply airflow (L 1 ) and circulated airflow (L 2 ) is conducted out of the supply air terminal device ( 10 ). The supply air terminal device includes an induction ratio control device ( 15 ), which is used to control how much circulated airflow (L 2 ) joins the supply airflow (L 1 ).

FIELD OF THE INVENTION

The invention concerns a supply air terminal device.

BACKGROUND OF THE INVENTION

Control of the induction ratio has become a requirement in supply airterminal devices, wherein fresh air is supplied by way of the supply airterminal device and wherein room air is circulated using the device.This means that the ratio between the flow of circulated air and theflow of fresh air can be controlled.

OBJECTS AND SUMMARY OF THE INVENTION

In the present application, primary airflow means that flow of supplyair, and preferably the flow of fresh supply air, which is supplied intothe room or such by way of nozzles in the supply air manifold. Secondaryair flow means the circulated air flow, that is, that air flow, which iscirculated through a heat exchanger from the room space and which airflow is induced by the primary air flow.

For implementation of the above-mentioned control the presentapplication proposes use of a separate induction ratio control device.According to the invention, the induction ratio control device may belocated below the heat exchanger in the mixing chamber. Control mayhereby take place by controlling the flow of circulated air L₂. The morethe air flow L₂ is throttled, the lower the induction ratio will be,that is, the air volume made to flow through the heat exchanger becomessmaller in relation to the primary air flow.

Besides the above-mentioned way of controlling the induction ratio, sucha control device may also be used, which is formed by a set of nozzlesformed by nozzles in two separate rows opening from the supply chamberfor fresh air, whereby the nozzles in the first row are formed with abigger cross-sectional flow area than the nozzles in the second row. Theinduction ratio control device includes an internal aperture plate usedfor controlling the flow between the nozzle rows of the said nozzles.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, the invention will be described by referring to someadvantageous embodiments of the invention shown in the figures of theappended drawings, but the intention is not to limit the invention tothese embodiments only.

FIG. 1A is an axonometric view of a supply air terminal device accordingto the invention, which is open at the bottom and open at the top.

FIG. 1B is a cross-sectional view along line I—I of FIG. 1A.

FIG. 1C shows the area X₂ of FIG. 1B.

FIG. 2 shows an embodiment of the control device according to theinvention, wherein the control device is formed by a turning damperlocated in side chamber B₁.

FIG. 3A shows an embodiment of the induction ratio control device,wherein the device includes two nozzle rows 12 a ₁, 12 a ₂ . . . and 12b ₁, 12 b ₂ . . . for the primary air flow L₁, whereby the flow ratiobetween the nozzles of the nozzle rows is controlled with the aid of anaperture tube located in the supply chamber for the primary air flow,which tube includes flow apertures 18 b ₁, 18 b ₂ . . . for the nozzlesof one nozzle row 12 a ₁, 12 a ₂ . . . and flow apertures 18 a ₁, 18 a ₂. . . for the nozzles of the other nozzle row 12 b ₁, 12 b ₂ . . . .

FIG. 3B is an axonometric partial view of the solution shown in FIG. 3A.

FIG. 4A shows a fifth embodiment of the control device solutionaccording to the invention.

FIG. 4B shows the area X₃ of FIG. 4A on an enlarged scale.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1A is an axonometric view of the supply air terminal device 10. Inorder to show the internal parts of the structure, end plate 10 d is cutopen in part. The structure includes end plates 10 d at both ends.Supply air L₁ is conducted by way of a supply channel into supply airchamber 11, from which the air is conducted further through nozzles 12 a₁, 12 a ₂ . . . , 12 b ₁, 12 b ₂ . . . into side or mixing chambers B,of the device on both sides of the vertical central axis Y, of thedevice and therein downwards. The supply air terminal device 11 includesa heat exchanger 14 in side chamber B, in its upper part as seen in thefigure. Side chambers B, are open at the top and at the bottom. Thus,the flow of circulated air L₂ is circulated induced by the primaryairflow L₁ through heat exchanger 14 into side chamber B₁, wherein theairflows L₁, L₂ are combined, and the combined airflow L₁+L₂ is made toflow to the side from the device guided by guiding parts 10 b ₁, 13 orsuch. The secondary airflow L₂ is thus brought about by the primaryairflow L₁ from the nozzles 12 a ₁, 12 a ₂ . . . and 12 b ₁, 12 b ₂ . .. of supply chamber 11. In side chamber B₁ the airflows L₁, L₂ arecombined, and the combined airflow is made to flow to the side guided byair guiding parts 13 and the side plates 10 b ₁ of the supply airterminal device, preferably at ceiling level. Heat exchanger 14 may beused for either cooling or heating the circulated air L₂. Under thesecircumstances, the circulated air L₂ circulated from room H can betreated according to the requirement at each time either by heating itor by cooling it using heat exchanger 14. Heat exchanger 14 includestubes for the heat transfer medium and, for example, a lamella heatexchanger structure in order to achieve an efficient transfer of heatfrom the circulated air to the lamellas and further to the heat transferliquid, when the flow of circulated airflow L₂ is to be cooled, or theother way round, when the flow of circulated airflow L₂ is to be heated.

FIG. 1B is a cross-sectional view along line I—I of FIG. 1A of a firstadvantageous embodiment of the invention. Supply air terminal device 10includes a supply air chamber 11 for the fresh supply air, from whichthe fresh air is conducted as shown by arrows L₁ through nozzles 12 a ₁,12 a ₂ . . . ; 12 b ₁, 12 b ₂ . . . into the respective side or mixingchamber B₁ of the device and further into room space H. Supply airchamber 11 is located centrally in the device. Heat exchanger 14 islocated in front of supply air chamber 11 (above it in the figure) andside chambers B₁ are formed on both sides of the vertical central axisY, of the device in between side plates 10 b ₁ and the side plates 11 a,of supply air chamber 11. As the figure shows, side chamber B₁ is astructure open both at the top and at the bottom. Circulated air L₂induced by the fresh airflow L₁ flows into side chamber B₁ from room H,whereby the combined airflow L₁+L₂ is made to flow further away from thedevice, preferably to the side horizontally in the direction of theceiling and further at ceiling level. According to the invention, thebody R of the device includes side plates 10 b ₁ and air guiding parts13 in connection with supply air chamber 11 at its lower edge. Together,the supply air chamber 11 and the side plates 10 b ₁ limit the chamberBI located at the side of the device. The circulated airflow L₂ flowsthrough heat exchanger 14 of the device into side chamber B₁ induced bythe supply airflow L₁. Air guiding parts 13 and side plates 10 b ₁ areshaped in such a way that the combined airflow L₁+L₂ will flow in thehorizontal direction to the side and preferably in the ceiling leveldirection and along this. The heat exchanger 14 may be used for coolingor heating the circulated air L₂. In the embodiment shown in the figure,the device includes an induction ratio control device 15, which is usedfor controlling the flow volume ratio Q₂/Q₁ between the flows L₁ and L₂.

Below the nozzles 12 a ₁, 12 a ₂ . . . of the first row of nozzles thenozzles 12 b ₁, 12 b ₂ . . . of the second row of nozzles and thecontrol plate 150 of the induction ratio control device 15 include flowapertures J₁, J₂ . . . located above for nozzles 12 a ₁, 12 a ₂ . . .and flow apertures I₁, I₂ . . . located below for nozzles 12 b ₁, 12 b ₂. . . When plate 150 is moved in a linear direction vertically (arrowS₁), the flow apertures J₁, J₂ . . . , I₁, I₂ . . . of plate 150 will beplaced in a certain covering position in relation to nozzles 12 a ₁, 12a ₂ . . . , 12 b ₁, 12 b ₂ . . . and their supply apertures e₁, e₂ . . ., t₁, t₂ . . . Thus, the flow L₁ can be controlled as desired fromnozzles 12 b ₁, 12 b ₂ . . . , 12 a ₁, 12 a ₂ . . . In addition, thesupply apertures e₁, e₂ . . . , t₁, t₂ . . . of the nozzles 12 b ₁, 12 b₂ . . . , 12 a ₁, 12 a ₂ . . . are preferably made to be of differentsize, whereby the flow can be controlled as desired through the nozzles12 b ₁, 12 b ₂ . . . , 12 a ₁, 12 a ₂ . . . of the nozzle rows havingcross-sectional flow areas of different sizes. By increasing the flow L₁through nozzles 12 a ₁, 12 a ₂ . . . of one nozzle row by acorresponding volume the flow through the nozzles 12 b ₁ 12 b ₂ . . . ofthe other nozzle row is reduced, and vice versa. In this manner the rateof flow L₁ can be controlled in side chamber B₁ and that inductioneffect can also be controlled, which flow L₁ has on flow L₂, that is,the induction ratio between the flows L₁ and L₂ can be determined. Theinduction ratio means the relation of flow volume Q₂ of flow L₂ to theflow volume Q₁ of flow L₁, that is, Q₂/Q₁. The combined airflow L₁+L₂flows guided by side guiding parts 13 and 10 b ₁ preferably to the sidefrom the supply air terminal device. With devices according to theinvention, the induction ratio is typically in a range of 2-6.

FIG. 1C shows the area X₂ of FIG. 1B on an enlarged scale.

FIG. 2 shows a second advantageous embodiment of the invention, whereinthe induction ratio control device 15 is formed by a control plate 150turning in side chamber B₁. Control plate 150 is articulated to turnaround pivot point N₁, and control plate 150 is moved by an eccentricpiece mechanism 17, which includes a shaft 17 a, adapted to rotate aneccentric disc 17 a ₂. Eccentric disc 17 a ₂ for its part rotatescontrol plate 150. Thus, in the embodiment shown in FIG. 2, theinduction distance of jet L₁ is controlled in side chamber B₁ and thusthe induction ratio Q₂/Q₁ between the flows L₂ and L₁ is controlled.

FIG. 3A shows an embodiment of the invention, wherein the inductionratio control device 15 is formed in supply air chamber by a turningtube 18 located inside it and including flow apertures 18 a ₁, 18 a ₂ .. . , 18 b ₁, 18 b ₂ . . . in two rows roughly on opposite sides of tube18. Supply air chamber 11, which is a structure having a circular crosssection, includes nozzles 12 a ₁, 12 a ₂ . . . , 12 b ₁, 12 b ₂ . . . intwo rows, into which flow apertures e₁, e₂ . . . , t₁, t₂, . . . open.By turning tube 18 (as shown by arrow S₁) including internal apertures18 a ₁, 18 a ₂ . . . , 18 b ₁, 18 b ₂ . . . the apertures 18 a ₁, 18 a ₂. . . , 18 b ₁, 18 b ₂ . . . in tube 18 are moved to the desiredcovering position in relation to supply apertures e₁, e₂ . . . , t₁, t₂. . . of the nozzles 12 a ₁, 12 a ₂ . . . ; 12 b ₁, 12 b ₂ . . . Nozzles12 b ₁, 12 b ₂ . . . have larger nozzle apertures t₁, t₂ . . . than thenozzles 12 a ₁, 12 a ₂ . . . located beside them, which have nozzleapertures e₁, e₂, . . . with a smaller cross-sectional flow area thanthe flow apertures t₁, t₂ . . . of nozzles 12 b ₁, 12 b ₂ . . . Thefollowing is arranged on the other side of central axis Y, at thelocation of the rows of nozzles 12 a ₁, 12 a ₂ . . . , 12 b ₁, 12 b ₂ .. . Nozzles 12 b ₁, 12 b ₂ . . . are located below nozzles 12 a ₁, 12 a₂ . . . According to the invention, by rotating the internal tube 18 ofthe tubular supply air chamber 11 the flow can be guided as desiredeither into nozzles 12 b ₁, 12 b ₂ . . . or into nozzles 12 a ₁, 12 a ₂. . . In this manner the flow rate of supply airflow L₁ in side chamberB, can be changed, and in this way the induction ratio between the flowsL₂ and L₁ can be controlled, that is, the induction effect of flow L₁ onthe flow of circulated air L₂ can be controlled. By increasing the flowinto the nozzles of one nozzle row, for example, into nozzles 12 a ₁, 12a ₂ . . . , by a corresponding volume the flow is reduced into thenozzles 12 b ₁, 12 b ₂ . . . of the other row, or the other way round.The total flow volume for flow L₁ through nozzle rows 12 a ₁, 12 a ₂ . .. ; 12 b ₁, 12 b ₂ . . . remains constant, but the flow rate changes,whereby the induction ratio is controlled.

FIG. 3B is an axonometric partial view of the solution shown in FIG. 3A.

FIG. 4A shows a fourth advantageous embodiment of the invention, whereinthe induction ratio between flows L₁ and L₂ is controlled by controllinga plate 10 c, located in exhaust opening 30 and joined to side plate 10b. As shown by arrow O₁ in the figure, the plate 10 c ₁ can be turnedaround pivot point N₂ to the desired angle, whereby the induction ratiobetween flows L₁ and L₂ is also controlled.

FIG. 4B shows the area X₃ of FIG. 4A on an enlarged scale. As shown inthe figure, the plate 10 c ₁ can be turned around pivot point N₂ asshown by arrow O₁.

We claim:
 1. A supply air terminal device, comprising: a body having atop portion, bottom portion, a first side plate and a second side plate,said body defining a first side chamber and a second side chamber andsaid bottom portion defining a first exhaust opening and a secondexhaust opening, each of said first and second exhaust opening isrespectively in flow communication with said first side chamber and saidsecond side chamber; a heat exchanger arranged in said top portion ofsaid body, said heat exchanger is structured and arranged for receivingand treating a circulated air flow and passing said air flow into saidfirst and second side chambers; a supply enclosure positioned withinsaid body, said supply enclosure having a plurality of apertures anddefining a supply chamber for receiving a supply air flow, said supplychamber is structured and arranged to guide said supply air flow fromsaid supply chamber through said plurality of apertures to said firstand said second side chambers; at least one control assembly positionedin at least one of said first and second side chambers, said controlassembly comprising a control plate that is pivotably mounted andselectively rotatable so that a selected portion of said plate extendsat least partially across a corresponding one of said first and secondside chambers; and means for selectively rotating said control plate;whereby a ratio of said supply air flow to said circulated air flow inan airflow exiting through said corresponding one of said first andsecond exhaust openings is controlled.
 2. The supply air terminal deviceaccording to claim 1, wherein the means for selectively rotating saidcontrol plate is a pivotably mounted eccentric disk.
 3. A supply airterminal device, comprising: a body having a top portion, bottomportion, a first side plate and a second side plate, said body defininga first side chamber and a second side chamber and said bottom portiondefining a first exhaust opening and a second exhaust opening, each ofsaid first and second exhaust opening is respectively in flowcommunication with said first side chamber and said second side chamber;a heat exchanger arranged in said top portion of said body, said heatexchanger is structured and arranged for receiving and treating acirculated air flow and passing said air flow into said first and secondside chambers; a supply enclosure positioned within said body, saidsupply enclosure having a plurality of apertures and defining a supplychamber for receiving a supply air flow, said supply chamber isstructured and arranged to guide said supply air flow from said supplychamber through said plurality of apertures to said first and saidsecond side chambers; at least one control assembly positioned in atleast one of said first and second side chambers, said control assemblycomprising a control plate that is pivotably mounted and selectivelyrotatable so that a selected portion of said plate extends at leastpartially across a corresponding one of said first and second exhaustopening; and means for selectively rotating said control plate; wherebya ratio of said supply air flow to said circulated air flow in anairflow exiting through said corresponding one of said first and secondexhaust openings is controlled.
 4. The supply air terminal deviceaccording to claim 3, wherein the control plate is connected tocorresponding one of said first side plate and said second side plate.